Gez
First Post
The reason is not law vs. chaos. Otherwise, eladrins and archons would fight too.
The reason is evil. Xenophobia and hatred are evil thoughts, and fiends, who are evil incarnate, are necessarily xenophobiac and hateful. The fiends fight among themselves, and against each others, and against the celestials, and against every thing, one way or another.
Besides, it was also needed for internal consistency. Since they are more numerous and agressive than other planar denizens, they would have eradicated everything if they weren't checked down by infighting.
The reason is evil. Xenophobia and hatred are evil thoughts, and fiends, who are evil incarnate, are necessarily xenophobiac and hateful. The fiends fight among themselves, and against each others, and against the celestials, and against every thing, one way or another.
Besides, it was also needed for internal consistency. Since they are more numerous and agressive than other planar denizens, they would have eradicated everything if they weren't checked down by infighting.